淮南矿区原煤筛分技术应用实践

介绍了淮南矿区原煤筛分技术的发展情况,对比分析了香蕉筛、博后筛、弛张筛等筛分设备的运行特点和性能指标,结果表明,弛张筛以其低能耗、低噪音、高振动强度、筛面能自清理等突出优势,更适应淮南矿区原煤筛分工艺要求。     

复混肥生产中振网筛结构的改进

探讨复混肥生产筛分设备的选型与结构的改进。对传统筛分设备(偏心振动筛)与单轴惯性振网筛性能进行对比;对新型振网筛使用中存在的结构缺陷进行研究与改进。使用振网筛后,筛分设备的故障减少,备件费用与电费降低。     

圆形摇摆筛取代方形振动筛用于PVC的筛分

用圆形摇摆筛取代方形振动筛用于PVC筛分,通过对比发现圆形摇摆筛处理能力大、维修频次少、节能、事故隐患减少,且产品质量稳定。     

博后筛——潮湿难筛物料的最佳筛分设备

北京博后筛分公司设计的博后筛采用分段式、独立筛面振动、筛箱不振动的结构形式,降低了筛分设备的参振质量,实现了筛分设备的大型化;采用特有的大振幅、大振动强度和弹性筛面的运动参数,可有效筛分潮湿细粒级难筛物料。多家煤炭企业的应用实践表明,博后筛筛分效果良好,处理能力大。     

提高冷却筛冷却效果初探

<正>前不久,某机械公司应邀为四川一家肥料企业设在新疆的分公司试制了2台冷却筛。第一台冷却筛(以下简称初试冷却筛)运到现场经初试运行,效果不甚理想,冷却筛筛分后的物料温度仍然在65℃左右,温度降不下来。为什么呢?以下结合冷却筛分设备的现状对初试冷却筛冷却效果进行分析探讨。1冷却筛分设备现状用于化肥行业物料分级的设备基本有十余类,如回转筛、滚筒筛、振动筛、摇筛等。与筛分设备结合的冷却设备一般为回转冷却     

高频振网筛在玻璃原料筛分中的应用

新型筛分设备高频振网筛是玻璃原料筛分中较理想工设备,能高效便捷地筛分各种玻璃原料组分,产量高,能耗少,污染小。本文介绍了高频振网筛的工作原理,结构特点,技术参数和工作特性。     

PC—1型偏心振动筛试制

<正> 我厂原生产以碳铵为主要氮源的粉状复混肥料,1986年底改产尿素—过磷酸钙,系颗粒状复混肥料。在生产过程中,筛选设备不够理想。我们参照兄弟厂的不同筛型,并查阅国内外文献资料,着手进行筛子的改造试制。一、对现有筛型的分析首先,对现有的各种筛子进行分析。 (1)园筒式滚筛筛网实际使用面积小,约1/3左右,物料的滚动依靠安装的倾角和筛体的径向运动,筛分效率和生产能力低,网孔极易堵塞,清理困难。     

QS585 型压力曲筛、LZS600 型离心筛的结构、原理及其比较

本文阐述ＱＳ５８５型压力曲筛、ＬＺＳ６００型卧式锥篮型离心筛的结构、性能、原理及其比较,说明ＱＳ型压力曲筛是一种先进的、现代化的静止高效筛分设备。     

压力曲筛的原理、应用与洗涤

本文阐述压力曲筛的结构、性能、原理、使用和洗涤，同时较详细介绍我国淀粉行业应用压力曲筛替代原来圆筒筛、平筛和离心筛，取得良好的经济效益。说明压力曲筛是一种应用于固液分离、筛分、过滤、洗涤等场合的先进的、静止高效的筛分设备。     

筛片交叉式筛分设备的研制及应用

论述了筛片交叉式筛分设备——交叉筛的工作原理,利用"动态筛孔"筛分理念,使筛分过程不粘、不堵、不卡,提高了筛分效率,解决了细粒湿粘物料筛分难题;企业应用后取得了很好的经济效益。     

Insect antifeedant properties of anthranoids from the genusVismia

Vismiones and ferruginins, representatives of a new class of lypophilic anthranoids from the genusVismia were found to inhibit feeding in larvae of species ofSpodoptera, Heliothis, and inLocusta migratoria.     

Direct observation of freeze-thaw instability of latex coatings via high pressure freezing and cryogenic SEM

Despite its industrial importance, the subject of freeze-thaw (F/T) stability of latex coatings has not been studied extensively. There is also a lack of fundamental understanding about the process and the mechanisms through which a coating becomes destabilized. High pressure (2100 bar) freezing fixes the state of water-suspended particles of polymer binder and inorganic pigments without the growth of ice crystals during freezing that produce artifacts in direct imaging scanning electron microscopy (SEM) of fracture surfaces of frozen coatings. We show that by incorporating copolymerizable functional monomers, it is possible to achieve F/T stability in polymer latexes and in low-VOC paints, as judged by the microstructures revealed by the cryogenic SEM technique. Particle coalescence as well as pigment segregation in F/T unstable systems are visualized. In order to achieve F/T stability in paints, latex particles must not flocculate and should provide protection to inorganic pigment and extender particles. Because of the unique capabilities of the cryogenic SEM, we are able to separate the effects of freezing and thawing, and study the influence of the rate of freezing and thawing on F/T stability. Destabilization can be caused by either freezing or thawing. A slow freezing process is more detrimental to F/T stability than a fast freezing process; the latter actually preserves suspension stability during freezing. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, October 27–29, 2004 in Chicago, IL. Tied for first place in The John A. Gordon Best Paper Competition.     

Ethanol and (−)-α-Pinene: Attractant Kairomones for Bark and Ambrosia Beetles in the Southeastern US

In 2002–2004, we examined the flight responses of 49 species of native and exotic bark and ambrosia beetles (Coleoptera: Scolytidae and Platypodidae) to traps baited with ethanol and/or (−)-α-pinene in the southeastern US. Eight field trials were conducted in mature pine stands in Alabama, Florida, Georgia, North Carolina, and South Carolina. Funnel traps baited with ethanol lures (release rate, about 0.6 g/day at 25–28°C) were attractive to ten species of ambrosia beetles (Ambrosiodmus tachygraphus, Anisandrus sayi, Dryoxylon onoharaensum, Monarthrum mali, Xyleborinus saxesenii, Xyleborus affinis, Xyleborus ferrugineus, Xylosandrus compactus, Xylosandrus crassiusculus, and Xylosandrus germanus) and two species of bark beetles (Cryptocarenus heveae and Hypothenemus sp.). Traps baited with (−)-α-pinene lures (release rate, 2–6 g/day at 25–28°C) were attractive to five bark beetle species (Dendroctonus terebrans, Hylastes porculus, Hylastes salebrosus, Hylastes tenuis, and Ips grandicollis) and one platypodid ambrosia beetle species (Myoplatypus flavicornis). Ethanol enhanced responses of some species (Xyleborus pubescens, H. porculus, H. salebrosus, H. tenuis, and Pityophthorus cariniceps) to traps baited with (−)-α-pinene in some locations. (−)-α-Pinene interrupted the response of some ambrosia beetle species to traps baited with ethanol, but only the response of D. onoharaensum was interrupted consistently at most locations. Of 23 species of ambrosia beetles captured in our field trials, nine were exotic and accounted for 70–97% of total catches of ambrosia beetles. Our results provide support for the continued use of separate traps baited with ethanol alone and ethanol with (−)-α-pinene to detect and monitor common bark and ambrosia beetles from the southeastern region of the US.     

Methyl 2,4,6-decatrienoates Attract Stink Bugs and Tachinid Parasitoids

Halyomorpha halys (Stål) (Pentatomidae), called the brown marmorated stink bug (BMSB), is a newly invasive species in the eastern USA that is rapidly spreading from the original point of establishment in Allentown, PA. In its native range, the BMSB is reportedly attracted to methyl (E,E,Z)-2,4,6-decatrienoate, the male-produced pheromone of another pentatomid common in eastern Asia, Plautia stali Scott. In North America, Thyanta spp. are the only pentatomids known to produce methyl 2,4,6-decatrienoate [the (E,Z,Z)-isomer] as part of their pheromones. Methyl 2,4,6-decatrienoates were field-tested in Maryland to monitor the spread of the BMSB and to explore the possibility that Thyanta spp. are an alternate host for parasitic tachinid flies that use stink bug pheromones as host-finding kairomones. Here we report the first captures of adult and nymph BMSBs in traps baited with methyl (E,E,Z)-2,4,6-decatrienoate in central Maryland and present data verifying that the tachinid, Euclytia flava (Townsend), exploits methyl (E,Z,Z)-2,4,6-decatrienoate as a kairomone. We also report the unexpected finding that various isomers of methyl 2,4,6-decatrienoate attract Acrosternum hilare (Say), although this bug apparently does not produce methyl decatrienoates. Other stink bugs and tachinids native to North America were also attracted to methyl 2,4,6-decatrienoates. These data indicate there are Heteroptera in North America in addition to Thyanta spp. that probably use methyl 2,4,6-decatrienoates as pheromones. The evidence that some pentatomids exploit the pheromones of other true bugs as kairomones to find food or to congregate as a passive defense against tachinid parasitism is discussed.     

2007～2008年世界塑料工业进展

收集了2007年7月～2008年6月世界塑料工业的相关资料,介绍了2007～2008年国外塑料工业的发展情况,提供了世界塑料产量、消费量及全球各类树脂的需求量及产能情况.按通用热塑性树脂(聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂)、工程塑料(尼龙、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚)、特种工程塑料(聚苯·硫醚、液晶聚合物、聚醚醚酮)、通用热固性树脂(酚醛、聚氨酯、不饱和聚酯树脂、环氧树脂)不同品种的顺序,对树脂的产量、消费量、供需状况及合成工艺、产品应用开发、树脂品种的延伸及应用的进一步扩展等技术作了详细介绍.     

2005～2006年国外塑料工业进展

收集了2005年7月～2006年6月国外塑料工业的相关资料,介绍了2005—2006年国外塑料工业的发展情况。提供了世界塑料产量、消费量及全球各类树脂生产量以及各国塑料制品的进出口情况。作为对比,介绍了中国塑料的生产情况。按通用热塑性树脂（聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂）、工程塑料（聚酰胺、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚）、通用热固性树脂（酚醛、聚氨酯、不饱和树脂、环氧树脂）、特种工程塑料（聚苯硫醚、液晶聚合物、聚醚醚酮）的品种顺序,对树脂的产量、消费量、供需状况及合成工艺、产品开发、树脂品种的延伸及应用的扩展作了详细的介绍。